This question is about the elements sodium and fluorine and the compound sodium fluoride.
Dilute aqueous sodium fluoride undergoes electrolysis.
Hydrogen is produced at the cathode.
State what is meant by the term electrolysis.
Write an ionic half-equation for the production of hydrogen at the cathode.
This question is about electricity and chemical reactions.
Aqueous copper(II) sulfate is an electrolyte.
The electrolysis of aqueous copper(II) sulfate using inert electrodes forms:
- copper at the cathode
- oxygen at the anode.
State what is meant by the term electrolyte.
State what happens to the colour of the aqueous copper(II) sulfate as this electrolysis progresses.
Write an ionic half-equation for the formation of copper at the cathode.
Give the formula of the ion that forms oxygen at the anode.
The electrolysis of aqueous copper(II) sulfate is repeated using copper electrodes.
State what happens to the anode.
Spoons can be electroplated with silver.
Name the substances used as:
the anode (positive electrode)
the cathode (negative electrode)
the electrolyte.
State two reasons why spoons are electroplated.
1
2
Which statement about electrolysis is correct?
Electrons move through the electrolyte from the cathode to the anode.
Electrons move in the external circuit towards the cathode.
Negative ions move in the external circuit towards the anode.
Positive ions move through the electrolyte towards the anode.
This question is about the elements sodium and fluorine and the compound sodium fluoride.
Dilute aqueous sodium fluoride undergoes electrolysis.
Hydrogen is produced at the cathode.
State what is meant by the term electrolysis.
This question is about electricity and chemical reactions.
Aqueous copper(II) sulfate is an electrolyte.
The electrolysis of aqueous copper(II) sulfate using inert electrodes forms:
- copper at the cathode
- oxygen at the anode.
State what is meant by the term electrolyte.
Which substance is not produced during the electrolysis of concentrated aqueous sodium chloride?
chlorine
hydrogen
sodium
sodium hydroxide
Many substances conduct electricity.
A student used the following apparatus to electrolyse concentrated aqueous sodium chloride using inert electrodes.
Name the gas formed at the positive electrode.
This question is about chemical reactions and electricity.
Brine is concentrated aqueous sodium chloride.
Name a different substance formed when molten sodium chloride is used instead of concentrated aqueous sodium chloride.
This question is about electricity and chemical reactions.
Spoons can be electroplated with silver.
State two reasons why spoons are electroplated.
1
2
An object is electroplated with silver using an aqueous silver salt as the electrolyte.
Which row is correct?
the object to be
electroplated is the
the other electrode
is made from
anode
carbon
anode
silver
cathode
carbon
cathode
silver
Aqueous copper(II) sulfate is electrolysed using carbon electrodes.
Which statement is correct?
Bubbles of hydrogen gas are formed at the anode.
Bubbles of oxygen gas are formed at the cathode.
Copper is deposited at the anode.
The blue colour of the solution fades.
Dilute aqueous sodium chloride is electrolysed using carbon electrodes.
What is the product at the anode?
carbon dioxide
hydrogen
oxygen
sodium
This question is about the elements sodium and fluorine and the compound sodium fluoride.
Dilute aqueous sodium fluoride undergoes electrolysis.
Hydrogen is produced at the cathode.
Write an ionic half-equation for the production of hydrogen at the cathode.